
        <form id="login" class="form-signin" style="max-width: 300px; margin:auto;">
            <div class="text-center mb-4">
                <div class="mr-auto ml-auto">
                    <h3 style=" display: inline;">登录至公告板</h3>
                </div>
                
            </div>
        
            <div class="text-center mb-4">
                <p>请使用邮箱前缀与密码作为凭证</p>
            </div>

            <div class="form-group m-auto">
                <input type="text" name="userID" class="form-control" placeholder="邮箱前缀" id="userID" required autofocus>
                <div class="invalid-feedback">
                    输入内容不能为空
                </div>
            </div>

            <div class="form-group m-auto">
                <input type="password" name="key" class="form-control" id="key" placeholder="密码" required>
                <div class="invalid-feedback">
                    输入内容不能为空
                </div>
            </div>
            <div class="checkbox mb-3">
                <label style="margin-bottom: 0.2rem; margin-top: 0.22rem;">
                    <input type="checkbox" name="tenDaysOff" id="tenDaysOff">
                    10天免登录
                </label>
            </div>

            <button class="btn  btn-primary btn-block" type="button" onclick="submitLogin()">登录</button>
            <a class="btn btn-outline-info col-sm-12 mt-4" href="/register" type="button">注册</a>
                
        </form>

        
        
